Hydraulic four-wheel-drive work vehicle
US8887855B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 1, 2011 |
| Grant date | Nov 18, 2014 |
| Priority date | — |
| Expiry date | Jul 1, 2031 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB60K17/344
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
At least one of first and second hydraulic motor units that drive first and second wheels is of a variable displacement. A volume adjusting mechanism thereof is operated by an electric motor in accordance with manual operation or automatic operation based on difference in turning radius between the first and second wheels. A control device that controls the electric motor includes normal mode that operates the electric motor in accordance with the manual operation or the automatic operation and torque-up mode that fixes the variable displacement hydraulic motor to a first volume larger than a standard volume, and activates the torque-up mode at idling state in which a power source is in operating state and a pump-side volume adjusting mechanism is in neutral state and shifts the torque-up mode to the normal mode when a traveling speed reaches a first speed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.